The continuously increasing trend of natural gas (NG) consumption due to its clean nature and abundant availability indicates an inevitable transition to an NG-dominated economy. Solidified natural gas (SNG) storage via combustible ice or clathrate hydrates presents an economically sound prospect, promising high volume density and long-term storage. Herein, we establish 1,3-dioxolane (DIOX) as a highly efficient dual-action (thermodynamic and kinetic promoter) additive for the formation of clathrate (methane sII) hydrate. By synergistically combining a small concentration (300 ppm) of the kinetic promoter L-tryptophan with DIOX, we further demonstrated the ultra-rapid formation of hydrates with a methane uptake of 83.81 (±0.77) volume of gas/volume of hydrate (v/v) within 15 min. To the best of our knowledge, this is the fastest reaction time reported to date for sII hydrates related to SNG technology and represents a 147% increase in the hydrate formation rate compared to the standard water–DIOX system. Mixed methane–DIOX hydrates in pelletized form also exhibited incredible stability when stored at atmospheric pressure and moderate temperature of 268.15 K, thereby showcasing the potential to be industrially applicable for the development of a large-scale NG storage system.

中文翻译：

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超快吸收和甲烷作为可燃冰的高度稳定存储

天然气（NG）由于其清洁的性质和丰富的可获得性而不断增长的趋势表明，不可避免地要过渡到以NG为主的经济。通过可燃冰或笼形水合物储存的固态天然气（SNG）具有良好的经济前景，有望实现高体积密度和长期存储。在本文中，我们建立了1,3-二氧戊环（DIOX）作为高效的双作用（热动力学和动力学促进剂）添加剂，用于形成笼形（甲烷sII）水合物。通过协同结合小浓度（300 ppm）的动力学促进剂L-色氨酸与DIOX的结合，我们进一步证明了水合物的超快速形成，在15分钟内甲烷吸收量为83.81（±0.77）体积气体/体积水合物（v / v）。据我们所知，这是迄今为止报道的与SNG技术有关的sII水合物的最快反应时间，与标准的水-DIOX系统相比，水合物的生成速率增加了147％。当在大气压和268.15 K的中等温度下储存时，呈颗粒状的甲烷-DIOX混合水合物还显示出令人难以置信的稳定性，从而显示出在工业上可用于开发大型NG储存系统的潜力。